Spark plug



T. E. NEW.

SPARK PLUG.

APPLICATION FILED ocT.26. 191B Patented Feb. 7, 1922.

gin/vento@ Tha-hai. E. New

attente l UNITED STATES' PATENT OFFICE.A

THMAS E. NEW, 0F CINCINNATI, OHIO, ASSIGNOR T0 PRECISION EQUIPMENT COM-PANY, OF CINCINNATI, CHIC', A CORIORATION OF KENTUCKY.

SIARK ELUG.

Application led October 26, 1918. Serial No.

Yand State of Ohio, have invented certain new and useful Improvements ina Spark Plug,

.of which the following is a specification.

This invention relates to interna] combustion engines,l and moreparticularly to spark plugs used in connection therewith, an object ofthe invention being to provide a spark plug which is designed so thatthe action of the piston of the engine with ,which the spark plug isused will prevent the accumulation of residue such as carbon, oil or thelike, upon the electrodes or sparking points of the ilug. l

More specifically, an object of this invention is to provide a sparkplug including a central stem provided with a longitudinally extendingbore, the lower end of which stem `forms one of the electrodes orsparking points of the spark plug, while theother electrode is shaped tohave its sparking point or end positioned adjacent to the lower end ofthe stem, whereby the inrush of air through the longitudinal bore of thestem, upon the suction stroke of the piston of the engine upon which thespark plug is used, will blow carbon, oil or other residue from thesparking ends of the two electrodes, and prevent the consequent foulingof the spark plug.

Another object of the invention is to pro- Vide a spark plug asspecified, wherein. valve Structure is -provided andarranged toautomatically scat itself upon the compression stroke of the piston ofthe engine, to prevent the escape of combustible gases through the boreot' the stem of the spark plug; also to provide adjustable means l'orregulating the amplitude of movement oi' the valve for varying theamount of air admitted tothe cylinders so as to provide the propermixture in each cylinder, which air entering the cylinder mixes with thegas therein, and tendsV to save gasoline or the volatile fuel used inthe engine.

Other objects of the invention will appear in the following detaileddescription, taken in connection with the accompanying drawing, forminga part of this specification, and in which drawing:

Figure 1 is a side elevation ot the improved spark plug, and

Specleaticn oi Letters Patent.

Figure 2 is a longitudinal the spark plug taken at right angles throughFi ure 1.

teferring more particularly to the drawing, 1 indicates the shell of thespark plug, winch is of the usual construction bein threaded, as shownat 2, for connection wit the .head of an ordinary internal combustionengine,and having an thereby. The shell 1 carries the-usual porcelain orinsulating' sleeve 4, through the lceirter of which a, stem 5 extends.The lower end of the stem 5 projects beyond the lower end'of theporcelain sleeve h4f, and also below the lower end of the shell 2,coacting with the electrode 3, in forming thesparking-point of the sparkplug. The stem 5 is threaded, u short distance upwardly of its lowerend, as shown at 6, which threaded portion engages in the washer 7 whichabuts the lower end of the porcelain sleeved. The stem .5 is providedwith a longitudinal bore 87 extendmg throughout its entire length, whichbore communicates, at the upper end of the stem, with a duct 9 formed inthe removable head 10 of the spark plu .v As shown in the drawings, thisremovab e head 10 is formed of suitable conducting material, and issubstantially hexagonal in shape, present-- ,ing a fiat edge surfacewhich engages against a washer 11 mounted upon the upper endof theporcelain sleeve 4. The stem 5 is threaded into the head 10 forconnecting the head to the main body of thespark plug.

The duct 9 which bore 8 of the stem 5 also has communication with anopening or recess 12 formed in the head and this recess or bore opensout through one or' the flat faces of the head 10, having its outerportion threaded for receiving therein a set screw 13. The set Screw 13has a stem 14 formed upon its inner end which is adapted for engagementwith the ball valve 15 which is seated in the vrecess l2. The hall valve15 is adapted to cut off communication between therecess 12 and therelatively short passageway 16 which communicates with the inner en'd ofthe recess 12 and with a transverse way 17. The transverse way 17 opensout into a counter sink or cup 18 formed in one of the upwardly facingsides of the head 1f) as clearly shown in ,Figure 2 of the drawing, soas to permit the entrance of air through the cup 18, ways 17 and 16 intothe recess 12 and from this 1-10 Patented Feb. 7,- 1922.

section through electrode 3 carried communicates with the .t Q Leone/ieciated, for causing a blast of'air about the 4spaced s'pinckinjg 'pointof the plus' to dow residue, such ""as'carbon, oil or the like fromthese sparking pointsand consequently pre- ;fventthe ,fouling di thesparking points or the plug. This air ',passing through the bore f 8ofthe stem 5. also mixes with the combustible fuel in the cylinder ofthe engine, tendtorequire a smaller'aniount of 4volatile or combustiblevfuel than is ,ordinarily the case", internal ,combustion engines, andconsequently resulting in economizing or saving: of gasoline, oranalogous fuel.

l "The adjustment of the set screws 13 regulatesthevamplitude ofmovement oi the ball'valve 15and consequently regulates the uantity of'air admitted to the cylinder t rou'ghthe bore 8. A locking nut 19 ismounted upon the set screw 13 for holding this set screw againstaccidental adjusted screw structure 20 is carried A -bindin i bytheihea10 for permitting the conneci tron of an electric conducting wirethereto.

It is evident that if it is so desired gasoline or other suitablevolatile liquid may be introduced into the cylinder of the engine,through the s ark plug, by lacing a small quantity of t e said volati efluid in the c11118 hanges in'details may be made without departing fromthe spirit of this invention,

f one side upon the upper end of the body portion and having a threadedaperture at 'said side for the reception of the upper end of said stemfor detachably securing the head block tothe body of the lug, said blockhaving a' downwardly inc ined recess therein opening through one of theupwardly facing sides and provided withy a valve seat in its `lower endand a passage leading from the .recessat a, point above the valve seatoomniunicating with said stein, a removable plug iiitt'ed through saidupwardly facing side for closing said recess, a Valve in said recessadapted to engage said valve -seat and 'said plug being adapted foradjustment' in y the recessto limit the movement oi' the valve,

said head block :further having a` lateral opening leading from beneathsaid valve seat upwardly through a second upwardly facing sidethroughwhich air is adapted to be fed to said stem through said recess when thevalve is opened.

2. in a spark plug, the combination of a body part having a hollow stemextending therethrough and screw threaded at its upper end, a headdetachably iitting upon the upper end of the body and provided with anopening threaded to receive the upper end ofthe stein and forcommunication with the stem, said head having a downwardly inolinedrecess therein opening through the upper face of the head andterminating in a valve seat at a point below said passage in the headand communicating with said passage, a plug fitting i'n said upper sideof the head for adjustment in the recess, a valve in the recess adaptedto normally engage said seat for closing the passage through the head,said head having an intake opening lcadino from the upper side of thehead to a point beneath said valve seat and adapted to admit air throughthe head, and a terminal connection carried upon the upper end of thehead and having electrical connection with said stem whereby a terminalwire may be attached to the spark plug without removing said head.

3. A spark plug having in combination a central electrode having alongitudinal passage th'erein; a valve cap positioned upon the terminalend of said electrode and having a passage therein, said passageextending downwardly and in angular relation Awith said longitudinalpassage and communicating therewith and with the atmosphere, a ballvalve seated in said downwardly ex tending passage and controlling thecommunication with the atmosphere, and adjustable means secured to they-upper portie of said passage for limiting the upward ,t ovement of theball in the passa e.

' T @MAS 'Et NEW-`

